Question about 2005 Pontiac Grand Prix

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Fan is okay on heater but no warm air coming out.

Fan is blowing on heater but no warm air is coming out. air conditioner seems to work okay.

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Could be the valve that controls hot water to the heater core or the heater core its self try flushing the cooling system 1st if that doesn't
help the control wire to the valve may have come loose at the valve or the back of the heat control
hope this helps

Posted on Nov 15, 2009

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It sounds like the valve may be stuck or broken that provides heat to the core. First check your water/fluid level in your radiator. If that is full then you want to look for a valve that is occassionally vacum operatedon one of the two lines, about 1" in diameter, that run from teh radiator core to the Firewall. normally these are on teh Passenger side. Look at this valve and see if it is vacum operated or manually operated by a cable. If it is cable operated make sure the cable is actually working, if it is vacum operated make sure you can open and close it by hand and that you have vacum on the line. If vacum is present and you can operate it by hand then the valve itself is faulty. Same if you can't operate it by hand. If there is no vacum you have a vacum problem and most likely need to trace teh vacum line back to it's source and or replace it. The Haynes repair manual for your vehicle will be able to assist you further and provide pictures and diagrams of teh system to follow.

Posted on Nov 15, 2009

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